international event which occurs every two years and obviously one of the most spectacular cities in the world. what i want to talk about is not the travel experience, but what the united states did in response to the general heading of the [speaker not understood] common ground. in the past [speaker not understood] deals with architecture and focuses on the different countries. obviously the u.s. has obviously great contributions and high-rise buildings and that was for many years a reoccurring theme by which we really showed the promise of this country in developing high-rise buildings and pushing the design and the structural solutions pretty much to the extreme artist of world architecture. this time, though, and i am extremely happy about it, we really participate in the discussion about common ground. and skipping fast forward to the u.s. pavilion, we chose the response to being spontaneous interventions which focused on citizen and individual-driven innovations and improving the urban environment. and can you having to the point, san francisco featured very prominently was [sp